Why can't I drag the files into order on my phone?

The grab handle relies on the browser's drag-and-drop events, which many touchscreen browsers do not fire from a finger. Use the up and down arrow buttons on each row instead; they do the same reordering with taps.

Can I merge a PDF that is still attached to an email?

Not directly. The Select files button opens your phone's file picker, which shows files stored on the phone or in a cloud drive, not attachments inside the mail app. Save the attachment from the mail app first, then pick it in the browser.

Does the merged file keep the bookmarks from the originals?

No. Pages are copied without their outline, so the result has no bookmarks. The Record the source file names option only stores the original file names in the PDF's subject field.

Where does the merged PDF go on an iPhone?

Safari asks whether to download merged.pdf and, by default, saves it to the Downloads folder in the Files app. On Android, Chrome saves it to Downloads and shows a notification.

One of my files is over 50 MB. Will it work on a phone?

It is allowed up to 100 MB, but the merge runs in the phone's memory and the page shows a warning that large files may struggle on a phone. If the merge fails with an out-of-memory message, split that file first or use a computer.

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Merge PDFs on an iPhone or Android phone without an app

Updated 2026-09-15

You have two or three PDFs on your phone and need them as one file, but you do not want to install anything or pay for an app. The Merge PDF tool at FreeAIPDF runs in Safari on an iPhone and in Chrome on Android, with no account. You pick the files, put them in order with on-screen arrow buttons, tap Merge, and save the result back to your phone. The files never leave the device.

Open Merge PDFFree, in your browser. Nothing is uploaded.

Getting the files where the picker can see them

Open the Merge PDF page in your phone's browser. You see a single Select files button. Tapping it opens your phone's own file picker, so the PDFs need to be somewhere that picker can reach. On an iPhone that is the Files app. On Android it is the system picker, which typically shows Downloads and any drive app you have installed.

A PDF that only exists inside an email or a chat has to be saved first. Use the share or save option in that app to put it in Files or Downloads, then come back to the browser tab.

The tool accepts PDFs only. A photo or screenshot is turned away with a message that it is not a supported file type for this tool. Turn photos into a PDF with JPG to PDF first, then merge that PDF with the others.

Ordering files with a touchscreen

On a computer each row in the file list has a grab handle for dragging rows into place. That drag relies on the browser's drag-and-drop events, which touchscreen browsers handle inconsistently; many do not start a drag from a finger at all. You do not need it.

Once two or more files are in the list, each row gets an up arrow and a down arrow at the right, next to the X that removes the file. Tap the arrows to walk a file to the position you want; the top row becomes the first pages of the merged file. The heading above the list reads 2 files selected, 3 files selected, and so on, and a note under the options says Add at least one more PDF to merge until you have two.

If you picked the files in the wrong batch, the compact Add more files box below the list adds the rest without starting over. The cap is 20 files, each under 100 MB; a file over the limit is refused with a message giving its size, and a 21st file with Only 20 files can be used at a time.

Options, the merge button, and where the file lands

Two settings appear once files are loaded. Output file name defaults to merged.pdf; you can type something else, and .pdf is added if you leave it off. Record the source file names is checked by default. It writes the original file names, separated by vertical bars, into the PDF's subject field. It does not create bookmarks. The merged file has no outline at all, even when the sources had one, because pages are copied without their bookmark trees. The result's producer and creator fields are set to FreeAIPDF.

The button at the bottom reads Merge 1 PDF with one file, then Merge 2 PDFs, Merge 3 PDFs, and so on, and stays disabled until at least two files are in the list. While it runs, the button reads Working… and a progress bar above it shows Merging followed by each file name, then Writing the merged file. When it finishes you see Your file is ready, a Download merged.pdf button, and Start over. Safari on an iPhone asks whether to download the file and, by default, puts it in the Downloads folder of the Files app. Chrome on Android saves it to Downloads and shows a notification.

Memory, size, and locked files

The merge happens entirely in the phone's memory, and the phone's RAM is the real ceiling, not the 100 MB limit. Any file over 50 MB shows a warning that large files are processed entirely in memory, so this can take a while and may struggle on a phone. If the merge fails with The browser ran out of memory on this file, split the largest file into parts first or use a computer.

Page content is copied as-is with no re-compression, so the output is roughly the sum of the inputs. Merge first and then run Compress PDF on the result if size matters.

A password-protected file stops the merge with a message naming the file, saying it is password protected, and pointing you to the Unlock PDF tool. Open it there with the password you already know, save the unlocked copy, and add that copy instead.

Keep the browser tab in front while the merge runs. Some phones throttle or pause a background tab, and there is nothing to resume on a server because nothing was sent to one.

Step by step

1Save each PDF to the Files app (iPhone) or Downloads (Android) if it is still inside an email or chat.
2Open the Merge PDF page in Safari or Chrome and tap Select files, then pick the PDFs from the file picker.
3Use the up and down arrows on each row to set the order; tap the X to remove a file, or Add more files to add one you missed.
4Change Output file name if you want something other than merged.pdf, and leave Record the source file names checked unless you do not want the names stored in the subject field.
5Tap Merge 2 PDFs (the number matches your list) and wait while the progress bar moves from Merging to Writing the merged file.
6Tap Download merged.pdf, confirm if the browser asks, then find the file in Downloads.

Questions

Why can't I drag the files into order on my phone?: The grab handle relies on the browser's drag-and-drop events, which many touchscreen browsers do not fire from a finger. Use the up and down arrow buttons on each row instead; they do the same reordering with taps.
Can I merge a PDF that is still attached to an email?: Not directly. The Select files button opens your phone's file picker, which shows files stored on the phone or in a cloud drive, not attachments inside the mail app. Save the attachment from the mail app first, then pick it in the browser.
Does the merged file keep the bookmarks from the originals?: No. Pages are copied without their outline, so the result has no bookmarks. The Record the source file names option only stores the original file names in the PDF's subject field.
Where does the merged PDF go on an iPhone?: Safari asks whether to download merged.pdf and, by default, saves it to the Downloads folder in the Files app. On Android, Chrome saves it to Downloads and shows a notification.
One of my files is over 50 MB. Will it work on a phone?: It is allowed up to 100 MB, but the merge runs in the phone's memory and the page shows a warning that large files may struggle on a phone. If the merge fails with an out-of-memory message, split that file first or use a computer.